Re: [PATCH] ARM: OMAP: MMC performance upgrade on OMAP2

[Tony Lindgren <tony@atomide.com>]

Hi,

* Syed Mohammed, Khasim <x0khasim@ti.com> [070308 23:38]:
> Hi Kyungmin,
> 
> For OMAP2420 there are few MMC erratas,
> 
> 1. If MMC controller is configured for 4bit and if MMC CLK frequency is
> over 24Mhz it has as a diminishing impact on throughput. Hence, it is
> not recommended to use a clock over 24MHz for MMC 4 bits mode.

> >@@ -1096,7 +1098,10 @@ static int __init mmc_omap_probe(struct
> >platform_device *pdev)
> >
> > 	mmc->ops = &mmc_omap_ops;
> > 	mmc->f_min = 400000;
> >-	mmc->f_max = 24000000;
> >+	if (cpu_class_is_omap2())
> >+		mmc->f_max = 48000000;
> >+	else
> >+		mmc->f_max = 24000000;
> > 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> > 	mmc->caps = MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;

How about throwing a cpu_is_omap2420() in there to work around the
clock limitation above mentioned by Khasim?

Tony